Hey mindless thats some nice duct tape. Its very sexy! lol. Well hopefull you will be able to find some MH bulbs and a ballast for your projector. See if you can find me a good bulb too! 😀 I have to say again, thats some nice duct taping work you've done there 
mindless_fool said:
Get a triplet from me 😀 thats the best route that you can go mindless 😀. you should post some pics of the setup in action. See how good your pics are.!!
ya i will do in a day or two...going to be busy for a bit...i will get a triplet from you...whenever i get some extra cash..need to sell my samsung e715 first...
mindless_fool
what OHP are you striping those parts from? is it a buhl?
looks alot like my old one 🙂
what OHP are you striping those parts from? is it a buhl?
looks alot like my old one 🙂
Low E Glass
Has anyone ever tried using Low E glass in a projector? You could theoretically place it in front of the source light, this would give you a signifigant heat barrier and a UV filter all in one... just curious...
Has anyone ever tried using Low E glass in a projector? You could theoretically place it in front of the source light, this would give you a signifigant heat barrier and a UV filter all in one... just curious...
Trapezoid Effects...
How is everyone handling the trapezoid effect caused from mounting the projector on the ceiling? I was thinking of developing a keystoning type apparatus that would allow you to push the bottom of the LCD panel forward and back while it is mounted in the projector... this would cause either the lower portion or the upper portion of the screen to be out of focus though I would think. Also, if you were to mount the projector parallel to the ceiling and offset the lens (either to the upper part or lower part of the lcd) wouldn't that square off the image? Let me know!
How is everyone handling the trapezoid effect caused from mounting the projector on the ceiling? I was thinking of developing a keystoning type apparatus that would allow you to push the bottom of the LCD panel forward and back while it is mounted in the projector... this would cause either the lower portion or the upper portion of the screen to be out of focus though I would think. Also, if you were to mount the projector parallel to the ceiling and offset the lens (either to the upper part or lower part of the lcd) wouldn't that square off the image? Let me know!
DR_BEV said:
ya it is a old buhl 80/14 but i find the halogen out of it not bright enough...need metal halide 🙁 you find any of the parts from your useful?
dual fresnels...
sorry about all the questions, but I have one more ( well two )
what is the dual fresnel setup for, and why is it only used in a few designs? and is there more than one type of fresnel? is the clear plastic lens on the base of an OHP suitible to use as a fresnel?
Thanks in Advance guys!
sorry about all the questions, but I have one more ( well two )
what is the dual fresnel setup for, and why is it only used in a few designs? and is there more than one type of fresnel? is the clear plastic lens on the base of an OHP suitible to use as a fresnel?
Thanks in Advance guys!
Thenoodpoopler, How far along are you now. And how much time will it be untill we can see some results.
cjab said:
I am waiting for my Proxima to arrive here, then i will be able to put a prototype together and get it running. I should have some result pics within a couple of weeks. Maybe around 3-4 weeks. Sorry for the long wait guys, but i will get it up as fast as i can! I am also looking for a good light engine. Hopefully I can find one soon!.
cjab do you have a projector, or currently working on one?
Sorry mine before was a useless post, I had already read that you were waiting on that Proxima, so sorry about that.
Well I have been reading on this forum for some time now, I havn't started. But I hope to in the near future. I'm trying to get a setup together that would work for me and not be too expensive.
Only problem is I'm not that technilogically advanced, but i hope I will be able to put one together.
Well I have been reading on this forum for some time now, I havn't started. But I hope to in the near future. I'm trying to get a setup together that would work for me and not be too expensive.
Only problem is I'm not that technilogically advanced, but i hope I will be able to put one together.
Alright... this is what I've gathered from a few hours of post surfing... someone please tell me if I am right or wrong!
Condenser lens: This will prevent a "dark spot" from appearing in the center of the panel, because there is no light in the center of the bulb.
Using two fresnel lenses: This will shorten the distance needed between the lcd panel and the final output lens, and also makes keystoning the image much easier.
UV filter: Just a piece of glass, since UV radiation will not pass through glass, should be pyrex as to not break under the extreme heat from the bulb.
Front Reflective Mirror: A mirror with the shiny side on the front, to prevent any ghosting.
And finally, hate to repeat myself but what the he** I'm here anyways, could I use the base from an overhead projector as a fresnel lens?
I work at a college, and our AV department has thousand of old OHP's, I already hijacked one 3M projector for the Triplet Lens, and I took the "fresnel" lens from the base , just in case 😀
Let me know! Thanks again guys!
Condenser lens: This will prevent a "dark spot" from appearing in the center of the panel, because there is no light in the center of the bulb.
Using two fresnel lenses: This will shorten the distance needed between the lcd panel and the final output lens, and also makes keystoning the image much easier.
UV filter: Just a piece of glass, since UV radiation will not pass through glass, should be pyrex as to not break under the extreme heat from the bulb.
Front Reflective Mirror: A mirror with the shiny side on the front, to prevent any ghosting.
And finally, hate to repeat myself but what the he** I'm here anyways, could I use the base from an overhead projector as a fresnel lens?
I work at a college, and our AV department has thousand of old OHP's, I already hijacked one 3M projector for the Triplet Lens, and I took the "fresnel" lens from the base , just in case 😀
Let me know! Thanks again guys!
Wow, this thread is almost embarassing.
Good to see lots of fellow Canadians taking on the hobby though.
In reply:
"Condenser lens: This will prevent a "dark spot" from appearing in the center of the panel, because there is no light in the center of the bulb."
- There's no light in the centre of the bulb eh? By simple optics and trigonomentry the condensor just captures the bulbs light and spreads it more evenly, and in conjunction with the proper reflector can focus a lot more light on the fresnels.
"Using two fresnel lenses: This will shorten the distance needed between the lcd panel and the final output lens, and also makes keystoning the image much easier."
-Most systems will not work with only 1 fresnel - keep in mind the OHP 'fresnels' are actually 2 fresnels glued together (back to back). Splitting the fresnels is common, but a little more searching will help you with that one.
"UV filter: Just a piece of glass, since UV radiation will not pass through glass, should be pyrex as to not break under the extreme heat from the bulb."
- UV is important to block, and glass does a good job, but IR is more important in terms of blocking heat, and IR filter glass is required to stop the infrared.
"Front Reflective Mirror: A mirror with the shiny side on the front, to prevent any ghosting."
-Yep
-Most people use fresnels from OHP's because ther are about 10 times less expensive than custom optical fresnels. The biggest OHP fresnels on the market are 12.2" square, slightly smaller than the width of a 15"LCD.
-Old OHPS etc are a great source, the light engines are usualy quite old and low powered (low color temp etc) - but the optics are all pretty similar.
Good to see lots of fellow Canadians taking on the hobby though.
In reply:
"Condenser lens: This will prevent a "dark spot" from appearing in the center of the panel, because there is no light in the center of the bulb."
- There's no light in the centre of the bulb eh? By simple optics and trigonomentry the condensor just captures the bulbs light and spreads it more evenly, and in conjunction with the proper reflector can focus a lot more light on the fresnels.
"Using two fresnel lenses: This will shorten the distance needed between the lcd panel and the final output lens, and also makes keystoning the image much easier."
-Most systems will not work with only 1 fresnel - keep in mind the OHP 'fresnels' are actually 2 fresnels glued together (back to back). Splitting the fresnels is common, but a little more searching will help you with that one.
"UV filter: Just a piece of glass, since UV radiation will not pass through glass, should be pyrex as to not break under the extreme heat from the bulb."
- UV is important to block, and glass does a good job, but IR is more important in terms of blocking heat, and IR filter glass is required to stop the infrared.
"Front Reflective Mirror: A mirror with the shiny side on the front, to prevent any ghosting."
-Yep
-Most people use fresnels from OHP's because ther are about 10 times less expensive than custom optical fresnels. The biggest OHP fresnels on the market are 12.2" square, slightly smaller than the width of a 15"LCD.
-Old OHPS etc are a great source, the light engines are usualy quite old and low powered (low color temp etc) - but the optics are all pretty similar.
OK, from my other post. and some searching. I also have some stuff to post.
I want to start my project in the near future. And want to take a simple yet effective approach.
One idea: lumen labs
I have a cousin who knows quite a bit of people and could possibly get deals on most of the stuff. Also an uncle who works with sheet metal, and could make the casing absolutly free, but would the casing out of this metal work?
Another approach I had was suggested In my other thread. To start out with a psone screen : doughboy-
The only thing is, I want to get decent results, and hopefully wont have to make another shortly down the road. Cause I want this one to last.
anyways, could someone help me out a little. This is my first big step on the DIY projectors. And I hope soon, i will be able to provide help for others. Thanks
I want to start my project in the near future. And want to take a simple yet effective approach.
One idea: lumen labs
I have a cousin who knows quite a bit of people and could possibly get deals on most of the stuff. Also an uncle who works with sheet metal, and could make the casing absolutly free, but would the casing out of this metal work?
Another approach I had was suggested In my other thread. To start out with a psone screen : doughboy-
The only thing is, I want to get decent results, and hopefully wont have to make another shortly down the road. Cause I want this one to last.
anyways, could someone help me out a little. This is my first big step on the DIY projectors. And I hope soon, i will be able to provide help for others. Thanks
Anyone interested in the lilliput 7" group buy?
http://www.diyaudio.com/forums/showthread.php?s=&threadid=36109
http://www.diyaudio.com/forums/showthread.php?s=&threadid=36109
cjab
using a psone LCD will give you descent results providing you don't project the image tooooo big!
also, there is a mod you can do to make the LCD accept VGA and is said to increase the resolution. i have not done / seen this yet but i know the RCA mod is very easy to do.
either way you go, using a psone LCD will give you wayyyy better results then say a fresnel and a 13" tv. 😀
using a psone LCD will give you descent results providing you don't project the image tooooo big!
also, there is a mod you can do to make the LCD accept VGA and is said to increase the resolution. i have not done / seen this yet but i know the RCA mod is very easy to do.
either way you go, using a psone LCD will give you wayyyy better results then say a fresnel and a 13" tv. 😀
Thanks!
Sorry for the stupid questions but I can't say I have ANY experience with this stuff whatsoever, and the amount of data you can gather in a forum like this can sometimes be a smidgeoned overwhelming 🙄
And BTW the condensor lens definition I had come up with didn't really make a lot of sense to me either, it was just what I had surmissed from a whole pile of other boards and posts :S
That all helps a lot, and I'm well on my way to making a DIY projector now, just a couple more questions though, sorry!
How do you determine the focal length of a fresnel lens? or is this even important?
What type of lens should be used for a condensor lens? Something like a magnifying glass lens?!?
And one more... I notice that some of the designs have a fresnel lens in front of the lcd as well as behind it, what is the purpose of this, it seems to me like it would distort the image, but as I said I KNOW NOTHING! If it didn't distort the image, it would make keystoning the image much easier (I think...) by removing the trapezoid effect caused by ceiling mounting a projector at a unparallel angle to the wall, am I right??
Thanks again
Thanks 🙂
Sorry for the stupid questions but I can't say I have ANY experience with this stuff whatsoever, and the amount of data you can gather in a forum like this can sometimes be a smidgeoned overwhelming 🙄
And BTW the condensor lens definition I had come up with didn't really make a lot of sense to me either, it was just what I had surmissed from a whole pile of other boards and posts :S
That all helps a lot, and I'm well on my way to making a DIY projector now, just a couple more questions though, sorry!
How do you determine the focal length of a fresnel lens? or is this even important?
What type of lens should be used for a condensor lens? Something like a magnifying glass lens?!?
And one more... I notice that some of the designs have a fresnel lens in front of the lcd as well as behind it, what is the purpose of this, it seems to me like it would distort the image, but as I said I KNOW NOTHING! If it didn't distort the image, it would make keystoning the image much easier (I think...) by removing the trapezoid effect caused by ceiling mounting a projector at a unparallel angle to the wall, am I right??
Thanks again
Thanks 🙂
Dr. Bev...
thought this might help... electronics is something I DO know quite a bit about, this might help others too, if you go to this web site you can get a datasheet for just about any LCD in existance, if they don't have it, you could request it, just make up a company name and tell them your some big corporation (thats what I did) they won't charge you and the data sheet is imperitive if your going to mod your LCD to accept VGA, i actually did the same mod on a sharp LCD I have, and it did increase the picture quality substantially, hope it works for you!
http://www.solar-technologies.com/search.php
thought this might help... electronics is something I DO know quite a bit about, this might help others too, if you go to this web site you can get a datasheet for just about any LCD in existance, if they don't have it, you could request it, just make up a company name and tell them your some big corporation (thats what I did) they won't charge you and the data sheet is imperitive if your going to mod your LCD to accept VGA, i actually did the same mod on a sharp LCD I have, and it did increase the picture quality substantially, hope it works for you!
http://www.solar-technologies.com/search.php
Just a heads up for you guys:
London Drugs has 7" Pyle tft monitors,480x234, very similar to mine, for $269. Would be excellent for those of you wishing to make a compact pj, but without the budget for an xga Lilliput. Results from my lcd of this resolution can be seen on the first page of this thread.
London Drugs has 7" Pyle tft monitors,480x234, very similar to mine, for $269. Would be excellent for those of you wishing to make a compact pj, but without the budget for an xga Lilliput. Results from my lcd of this resolution can be seen on the first page of this thread.
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